Year	Number
1960	5037000
1961	5037000
1962	5037000
1963	5037000
1964	5037000
1965	6534000
1966	6534000
1967	6534000
1968	6534000
1969	6534000
1970	9213000
1971	9213000
1972	9213000
1973	9213000
1974	9213000
1975	13230000
1976	13960000
1977	15070000
1978	16358000
1979	17326000
1980	18161000
1981	18797000
1982	19241000
1983	19871000
1984	20546000
1985	21175000
1986	21727000
1987	22664000
1988	23740000
1989	24797000
1990	25368000
1991	25911000
1992	26514000
1993	27336000
1994	28358000
1995	29411411
1996	30677755
1997	31879000
1998	32829000
1999	34021000
2000	35228000
2001	34579000
2002	34737600
2003	34550320
2004	34576487
2005	34068428
2006	33848510
2007	33462200
2008	34191893
2009	33506000
2010	33409000
2011	33252352
2012	33197391
2013	33383853
2014	33238083
2015	33211498
2016	32633398
2017	31768000
2018	31511000
2019	32748000
2020	32730000
2021	31703000
2022	29798000